On Thu, Jun 24, 2021 at 02:29:29PM +1000, David Gibson wrote: > But as I keep saying, some forms of grouping (and DMA aliasing as Alex > mentioned) mean that changing the domain of one device can change the > domain of another device, unavoidably. It may be rare with modern > hardware, but we still can't ignore the case. > > Which means you can't DMA block until everything in the group is > managed by a vfio-like driver. We just need the same restriction as today, the group fd will attach a domain under quite a wide range of conditions, and we can copy that. IIRC is not a requirement today that every device in the group have a vfio driver bound to it? Jason
